From there Two-Face, returned to a life of crime based on twos.  He robs a tennis double-header but gives the money to charity when the coin turns up good.  He kidnaps the body double of a wealthy eccentric for a $200K ransom but is thwarted when Batman and Robin infiltrate the operation in disguise.  As Batman tries to subdue Two-Face, the criminal slings his heavy coin, stunning the hero.  Faced with the opportunity to kill Batman, Kent's personality surfaces and sees himself as a better man.  He flees and finds wax-based make up to restore his feature.  He then visits Gilda claiming recent plastic surgery had fixed his injuries.  As they enjoy a candlelight dinner, the heat of the flames melt the wax, exposing his true features, horrifying Gilda and sending Two-Face on a rampage once again.  After tussling with Batman, Two-Face and his gang attack the shop of the man who sold him the make-up and burn his shop to the ground.  The mask maker's son vows revenge and uses the make-up to disguise himself as a member of Two-Face's gang.  He intercepts Two-Face at a robbery of a ball game and slips into gang.  He then passes information to Batman who follows them and the two subdue Two-Face and take him to prison (Detective Comics #68). 

Tw0- Face did not remain jailed for long, escaping before he could be brought to trial.  He re-formed a gang and began his crimes a new, sometimes robbing to give to charity, sometimes for himself, always at a flip of a coin.   One evening he robs a dual concerto and confronted by Batman, resolves to shoot the crime fighter.  Unknown to either of them, Kent's fiancee Gilda is also in attendance and attempts to intervene, only to be hit by the bullet.   The sight of his fallen love breaks Two-Face totally into the Kent persona, who realize that his persona as a monster was all of his own making and those who loved him as the handsome attorney, loved him still.   In the hospital, he commits himself to reform and Gilda but his gang still craves his criminal acumen.  When they snatch him from the police, he tells them he is going straight but they threaten him to share the crime he planned.  When he does they bind him in a warehouse and take off.  Angling himself near a window, Two-Face drops $2 bills from his wallet until passers-by report the odd occurrence to the police.  Realizing who it is, Batman speed to the warehouse, learns the plan and intercepts the crooks, ending the career of Two-Face.   Based on the extenuating circumstances and testimony from Batman, Kent is sentence to only a year in prison. Over that year, it is learned that the famed surgeon had escaped from Germany and made it to the US.  The miraculous physician completely restores Kent's original appearance and he returns to a life of law and order (Detective Comics #80)

At some point after this Harvey and Gilda are wed.  They live for years in peace tho Kent is plagued by nightmares.  In 1948, Kent's butler learns of this and begins to sedate Kent and conduct crimes disguised as Two-Face.  Batman eventually catches on and the butler arrested, clearing Kent's name (Batman #50).   In 1952, the story of Two-Face was made into a movie but a jealous prop man switches a fake vial for actual acid, burning actor Paul Sloan's face in a similar manner as Two-Face's.  Driven insane Sloan becomes the new Two-Face until defeated by Batman and turned over to a plastic surgeon.  Whether Sloan ever recovered is unknown (Batman #62).   Later that year, at an exhibit on crime, theater manager kidnaps Harvey Kent and disguises himself, going on a crime spree as Two-Face expecting Kent to take the blame.  His plans are eventually foiled by Batman (Detective Comics #187),

In 1955, Harvey and Gilda Kent attended the wedding of Bruce Wayne and Selina Kyle, where Kent was targeted by a hitman hired by a vengeful felon Kent had sent to prison.  The assassination is ultimately thwarted by Superman (Superman Family #211).  The later activities of Harvey Kent are unknown.  In the early 21st century, the Joker of Earth-Two had reached a decrepit old age and mourning lost comrades, attempts to recreate Two-Face by attacking Harry Sims, fiancee of Helena Wayne, with acid.  There are not records of Joker encountering Two-Face on Earth-Two and who he may have been remembering as deceased is unknown (Justice Society of America Annual #1).  Paul Sloane unhealed by his surgery, Harvey Kent having a relapse or a different individual entirely are possible and the Joker's death may have left the answer lost forever.